<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 2.为ECharts准备一个具备大小（宽高）的Dom -->
       <div id="main" style="width: 800px;height:500px;"></div>
    </el-card>
  </div>
</template>

<script>
  //1.导入echarts
import * as echarts from 'echarts'
import _ from 'lodash'   //两个对象的合并
  export default{
    data() {
      return{
        //需要合并的数据
        options: {
                title: {
                  text: '用户来源'
                },
                tooltip: {
                  trigger: 'axis',
                  axisPointer: {
                    type: 'cross',
                    label: {
                      backgroundColor: '#E9EEF3'
                    }
                  }
                },
                grid: {
                  left: '3%',
                  right: '4%',
                  bottom: '3%',
                  containLabel: true
                },
                xAxis: [
                  {
                    boundaryGap: false
                  }
                ],
                yAxis: [
                  {
                    type: 'value'
                  }
                ]
              }
      }
    },
    created() {

    },
    // 此时页面的元素已经被渲染完毕了！
    async mounted() {
       // 3.基于准备好的dom，初始化echarts实例
     var myChart = echarts.init(document.getElementById('main'));

       const {data: res} = await this.$http.get('reports/type/1')

       if(res.meta.status !== 200){
         return this.$message.error('获取数据失败！')
       }

     //4.准备数据和配置项
      const result =  _.merge(res.data,this.options)         //鼠标跟随效果   _.merge
                //5.展示数据
      myChart.setOption(result);
      },
    methods:{

    }
  }
</script>

<style lang="less" scoped>
</style>
